Expected value with empirical probabilities

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Problem

Gordon sent out a survey to all of the customers that recently ate at his restaurant. Each customer gave a ranking of the restaurant from 0 to 3 stars. The number of customers that chose a certain number of stars is shown in the table below.
Plot points to represent the expected sum of the number of stars for a randomly selected group of customers assuming that the survey results are representative for all of his customers.
StarsCustomers
010
164
242
384
Total200
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